Contacts: UI updates and ajax methods for categories.

apps/contacts/ajax/addproperty.php

apps/contacts/ajax/categories/add.php

apps/contacts/ajax/categories/checksumfor.php

apps/contacts/ajax/categories/delete.php

apps/contacts/ajax/categories/edit.php

apps/contacts/ajax/categories/list.php

apps/contacts/ajax/contactdetails.php

apps/contacts/ajax/saveproperty.php

apps/contacts/css/contacts.css

apps/contacts/index.php

apps/contacts/js/contacts.js

apps/contacts/lib/vcard.php

apps/contacts/templates/part.contact.php

lib/vcategories.php